Histórias da Geologia

Este blog pretende ser um espaço de reflexão sobre a evolução do conhecimento geológico ao longo dos tempos, principalmente a partir do século XVII, não esquecendo porém as pequenas histórias que fazem a grande história

domingo, abril 16, 2006

Terramoto de S. Francisco - 1906


Não foi por ontem ter sentido um pequeno tremor de terra que me lembrei que a 18 de Abril passam exactamente 100 anos sobre o grande Terramoto de S. Francisco, na verdade a National Geographic deste mês ao dedicar algum espaço despertou-me para este evento.


Em 1908, foi publicado o primeiro volume de um relatório de Andrew Lawson contendo descrições qualitativas dos efeitos do terramoto. Neste mesmo relatório, num segundo volume, são incluídos ainda sismogramas provenientes de 68 observatórios e um trabalho de Harry F. Reid (1910) sobre os mecanismos dos tremores de terra que conduziu à formulação da Teoria do Ressalto Elástico.

Following the great 1906 earthquake in San Francisco, Henry Fielding Reid examined the displacement of the ground surface around the San Andreas Fault. From his observations he concluded that the earthquake must have been the result of the elastic rebound of previously stored elastic strain energy in the rocks on either side of the fault. In an interseismic period the earth's plates (see plate tectonics) move relative to each other except at most plate boundaries where they are locked. (...) The stored energy is released during the rupture partly as heat, partly in damaging the rock and partly as elastic waves. Modern measurements using GPS largely support Reid’s theory as the basis of seismic movement, though actual events are often more complicated.

Wikipedia

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